private OpenedReader TryOpenReaderFromCodeView(PEReader peReader, DebugDirectoryEntry codeViewEntry, string assemblyPath)
{
OpenedReader result = null;
MetadataReaderProvider provider = null;
try
{
CodeViewDebugDirectoryData data = peReader.ReadCodeViewDebugDirectoryData(codeViewEntry);
string pdbPath = data.Path;
Stream pdbStream = null;
if (assemblyPath != null)
{
try
{
pdbPath = Path.Combine(Path.GetDirectoryName(assemblyPath), GetFileName(pdbPath));
}
catch
{
// invalid characters in CodeView path
return(null);
}
pdbStream = TryOpenFile(pdbPath);
}
if (pdbStream == null)
{
if (_symbolService.IsSymbolStoreEnabled)
{
Debug.Assert(codeViewEntry.MinorVersion == ImageDebugDirectory.PortablePDBMinorVersion);
SymbolStoreKey key = PortablePDBFileKeyGenerator.GetKey(pdbPath, data.Guid);
pdbStream = _symbolService.GetSymbolStoreFile(key)?.Stream;
}
if (pdbStream == null)
{
return(null);
}
// Make sure the stream is at the beginning of the pdb.
pdbStream.Position = 0;
}
provider = MetadataReaderProvider.FromPortablePdbStream(pdbStream);
MetadataReader reader = provider.GetMetadataReader();
// Validate that the PDB matches the assembly version
if (data.Age == 1 && new BlobContentId(reader.DebugMetadataHeader.Id) == new BlobContentId(data.Guid, codeViewEntry.Stamp))
{
result = new OpenedReader(provider, reader);
}
}
catch (Exception e) when(e is BadImageFormatException || e is IOException)
{
return(null);
}
finally
{
if (result == null)
{
provider?.Dispose();
}
}
return(result);
}